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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
Each oxygen atom has 6 valence electrons in its outer energy level When two oxygen atoms get close to each other, the attractions from the nucleus of both atoms attract the outer electrons. In this case, two electrons from each atom are shared.